关于node.js:爬虫spider

const originRequest = require('request');const cheerio = require('cheerio');const iconv = require('iconv-lite');const request = (url, cb ) => {    const options = {        url: url,        encoding: null    };    originRequest(url, options, cb);}for (let i=1; i< 10; i++) {    const url = `https://www.gdnync.com/news/snzx/list_1_${i}.html`;    request(url, (err, res, body) => {                const html = iconv.decode(body, 'gb2312');        const $ = cheerio.load(html);        const list = $('.list-group-item');        for (let i=0,len=list.length; i<len; i++) {            let title = list.eq(i).find('.nc-subcolumn-list-item-title').text();            console.log(title);        }    })}